LH1556FP/ LH1556FPTR - Dual 1 Form A Solid State Relay - Vishay Solid State RelaysLH1556FP The LH1556FP is robust, ideal for telecom and
ground fault applications. It contains two SPST nor-
mally open switches (1 Form A) that replace electro-
mechanical relays in many applications. It is
constructed using a GaAs LED for actuation control
and an integrated monolithic die for the Switch output.
The die, fabricated in a High-Voltage dielectrically iso-
lated BCDMOS technology, is comprised of a photo-
Diode array, Switch control circuitry and MOSFET
switches. In addition, it employs current-limiting cir-
cuitry which meets FCC 68.302 and other regulatory
voltage surge requirements when overvoltage protec-
tion is provided. By Vishay Intertechnology